update gitignore: node_modules and .DS_Store
simple CSV representations of the ABS ASGC codes
manually add a legend for the DataItems in API response

… because the f@#$%ing API methods for getting metadata constantly
return useless "An unknown error has occurred" messages.
hooray, the crawler produces useful output!

- added CSV module to parse GeoJSON-generated files with ASGC location
codes
- fetch each location code one by one
- then parse the (crazy verbose) XML response into a sensible JS data
structure
combine the other CSVs into an Australia-wide one for easier crawling
attempt to fetch metadata from SDMX API, to no avail!

THIS SHOULD WORK DAMN IT
upgrade crawler with better output structure

in the output dir, create files named after the dataset, and then write
CSV rows for the set of values over all available dates (with the
location name at the start of each row)